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It looks like hack and therefore I wanted this to be a very isolated
commit so we can find it & revert it easily if need be, but for now it
seems to work.
The idea is that Status is telling us how the candidate is in relation
to the current installed version which is used to figure out if a
package is "kept back" by the algorithm or not, but by discarding the
candidate version we loose this information.
Ideally we would keep better tabs on what we do to a package and why,
but for now that seems okayish. It will cause the wrong version to be
displayed though as if the package is installed the installed version
becomes the candidate and hence (installed => installed) is displayed.
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For a (partially) installed package like the one MarkInstall operates on
at the moment we want to discard the candidate from, we have to first
remove the package from the internal state keeping to have proper broken
counts and such and only then reset the candidate version which is a
trivial operation in comparison.
Take a look at the testcase: Now, what is the problem? Correct,
git:i386. Didn't see that coming, right? It is M-A:foreign so apt tries
to switch the architecture of git here (which is pointless, it knows
that this won't work, but lets fix that in another commit) will
eventually realize that it can't install it and wants to discard the
candidate of git:i386 first removing the broken indication like it
should, removing the install flag and then reapplies the broken
indication: Expect it doesn't as it wants to do that over the candidate
version which the package no longer had so seemingly nothing is broken.
It is a bit of a hairball to figure out which commit it is exactly that
is wrong here as they are all influencing each other a bit, but >= 2.1
is an acceptable ballpark. Bisect says 57df273 but that is mostly a lie.
Closes: #961266
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